package net.zjitc.servlet.request;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @Author Administrator
 * @Date 2020/5/14 15:42
 *
 * HTTP请求格式：请求行，请求头，空行，请求体（post才有）
 **/
@WebServlet("/requestDemo1")
public class RequestDemo1 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        /*req:请求对象request;  resp：响应对象response*/
        /*获取请求消息*/
        /*1,获取项目的虚拟路径：getContextPath()
             获取Servlet路径(别名)：getServletPath()
             URL（统一资源定位符），完整的访问路径：getRequestURL()
             URI（项目虚拟路径+servlet路径）：getRequestURI()
         */
        String contextPath = req.getContextPath();
        String servletPath=req.getServletPath();
        StringBuffer requestURL = req.getRequestURL();
        String requestURI = req.getRequestURI();
        System.out.println(contextPath);
        System.out.println(servletPath);
        System.out.println(requestURL);
        System.out.println(requestURI);
        String method = req.getMethod();
        System.out.println(method);



        /*2.获取请求头的数据：*/
        String agent = req.getHeader("User-Agent");
        System.out.println(agent);
        /*判断是哪个浏览器访问*/
        if (agent.contains("Chrome")){
            System.out.println("谷歌浏览器");
        }else if (agent.contains("Firefox")){
            System.out.println("火狐浏览器");
        }else {
            System.out.println("其他浏览器");
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //不用管get还是post请求
        this.doGet(req,resp);

    }
}
